Lync 2013 standard number of Backends required and pool paring setup?

Hi
I am in the process of putting together a lync 2013 implementation. The plan is to use lync 2013 standard as IM and Presence are the only requirement we have approx. 3000 users
we have two sites
Site A (Primary)
x 2 FE-A1 FE-A2 Lync 2013
x1 BE-A1 Lync 2013
Site B (D.R)
X 2 FE-B1 FE-B2 Lync 2013
X1 BE-B1 Lync 2013
what I want to know is
1. If Site A has two FE servers each will require there own pool if I pair FE-A1 with FE-A2 can I also pair FE-A1 with FE-B1 and the same for 2?
2. Can the servers FE-A1 and FE-A2 use the same BE server or should I be using a separate server for each?
3. In this design I was thinking of using two edge servers 1 at each site that would be published using TMG, would this be correct, this would be for IPhone mobile users to use.
thanks in advance
J

1) If site A has to FE servers, and you go with Standard edition, they would be their own pools. If you wanted HA you could put three enterprise servers together into a single pool and load balance them. If you pair FE-A1 with FE-A2, those
two pools cannot be paired with any other pool. You also can't Pair FE-A1 to FE-A2, then FE-A2 to FE-B1.
2) Your diagram looks like Lync 2013 for the back end, it would actually be SQL, and this would specifically apply if you're using Lync enterprise. If the Lync front end servers are in the same pool, they can use the same backend, if they're not they
need separate back ends.
3) Edge servers would be published with a standard firewall, if TMG is your firewall that would work. If TMG is only being used as a reverse proxy, you would use it to publish your web services on your front end servers. Either way, you'll need
to also publish the web services on your front end servers to the Internet for mobile clients to function.
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SWC Unified Communications
This forum post is based upon my personal experience and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Similar Messages

Certificate Requirement for Lync 2013 Standard Edition

I have successfully run the setup of lync 2013 standard edition now I am stuck due to certificates required for lync 2013. when I generate a csr. it show the subjected urls for that.
hostname.domain.com
sip.domain.com
diali.domain.com
meet.domain.com
admin.domain.com
lyncdiscover.domain.com
lyncdiscoverinternal.domain.com
im.domain.com (External URL)
so if I go for 3 party CA then I need 8 certicate only for internal lync. As I also need to connected federated partner and external user so I need Edge for again I need 3 more certificates
web.domain.com
a/v.domain.com
sip.domain.com
now when I go for these certificate it quit costly and I didn't understand why such certifcates required. can anyone help me to fix such requirement.
Or, what are the necessary url to which I buy 3 party CA rest leave as it is.
I also want to deploy Edge with single adopter as we have only one network so can anyone assist me to proceed it further.
Talha Faraz Malik

To save on the cost of your third party certificates, I would deploy an internal certificate authority to sign certificates for your internal front end. For your third party certificate, you would only need the SANs for the edge and for your
reverse proxy and as Edwin said, this can be a single cert with multiple SANs.
For example, for your edge you would need:
sip.domain.com
web.domain.com
You would not need A/V as this role does not require a SAN on your certificate. On the same certificate, which you could also use on your reverse proxy, you'd likely want the following FQDNs.
lyncdiscover.domain.com
im.domain.com (your external web services FQDN)
meet.domain.com
dialin.domain.com
You may also want to consider your internal web services FQDN and include the following so third party mobile devices can connect without needing a certificate installed:
im_internal.domain.com (your internal web services FQDN)
lyncdiscoverinternal.domain.com
I'm sure that's not entirely clear yet, so feel free to ask more questions or what the purpose of each is.
When you say Edge with a single adapter, you mean a single adapter in a DMZ or internal? You definably want two NICS, both in separate DMZs, but I've managed to get the edge working with a single adapter in a DMZ before. What you don't want is
the edge in your internal network.
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SWC Unified Communications
This forum post is based upon my personal experience and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Lync 2013 standard server for 3000

Planning to deploy Lync 2013 standard server for 3000 users, IM/presence, Audio/video, persistence chat, monitoring/archive. external access required so 1 edge server in DC and 1 in DR. No enterprise voice. DC and DR are corrected with dark fiber
one lync 2013 standard server in DC and 1 in DR. 1 edge server in DC and 1 Edge server in D R.have couple of queries.
1. can i get HA while doing server pairing in DC and DR?
2. how much time will it take for frontend failover if my frontend server is down in DC.
3. how much time will take for external access failover in DC and DR?
4. are there any potential risks if using standard version instead of enterprise?
Basically client need cost effective solution as lync is not critical for him, does not want to use 3 FE servers in DC and 3 FE in DR to achive HA. want to achieve the solution with standard servers.

1) HA typically refers to automatic failover, so not with Standard edition, but you can get manual failover with this with nearly full functionality.
2) Again, this is manual, but once invoked less than 20 minutes I'd think, possibly faster, only testing invoke-failover will tell you for sure but it won't be too bad.
3) This involves a topology change to change the federation route, possibly next hop for the edge, and possibly media path for a front end pool. That can be completed and replicated in under a minute. You may want to point your external simple
URLs and such (lyncdiscover) at the remaining server, this may be a DNS change to point to a separate reverse proxy. Your _sipfederationtls._tcp SRV record can have a lower matching partner as well, but I typically prefer to keep low TTLs on the external
DNS records so they can be changed quickly.
4) Sure, no automatic failover, your scalability is limited without building out new pools later, no SQL backend that can be mirrored for a bit more resiliency. But again, you can manually failover without issue, you just have to be able to tolerate
a short outage.
Technically, you'd only need 1 FE in the DR site. You have to match Ent/Ent or Std/Std in a pool pair, but the number of servers don't need to match. Still, the HLB and SQL requirements can be costly so I understand this.
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SWC Unified Communications

Lync 2013- Standard Edition - Persistent Chat

What is the capacity of the Persistent Chat if it is collocated on Lync 2013 Standard edition front end ?
ie, number of chat rooms /usage?
In a Lync 2013 standard edition deployment if Persistent Chat is on separate server, can the SQL be offloaded to central SQL cluster enviornment or it will be held on the local server?

I haven't seen a chart that really defines the capacity, and it's difficult to measure because it's difficult to say how active the rooms will be or how much content you'll generate. That much is different from organization to organization.
There are some guidelines in general here:
https://technet.microsoft.com/en-us/library/gg615006(v=ocs.15).aspx but they don't really touch the standard model.
The pChat database can be offloaded to a central SQL cluster if you'd prefer, there are no requirements to collocate it with the local Lync databases.
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer".
SWC Unified Communications
This forum post is based upon my personal experience and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Lync 2013 standard edition server disadvantages

I have 3000 users, client is so cost effective , wanna insisting on Lync 2013 standard edition server. no enterprise voice
Feature required :- IM.presence, A/V conf, persistence chat, external access.
planned servers :- 1 Standard server in DC, 1 in DR. 1 edge server in DC and 1 in DR
1. if i make a pool of standard servers, then will it serve as HA, if yes how much time wil take for failover and what would be the impact on users?
2. If complete DC is down how mch time would take for fail-over and what is the procedure, impact on users?
3. can i collocate persistence chat role on standard edition? any limitation? how backend sizing would be for persistence chat as sql express would be there
4. can i suggest any better solution with standard servers where HA in DC .

For 3000 users Standard Edition will be fine. Use the capacity planner to size out your environment. http://www.microsoft.com/en-us/download/details.aspx?id=36828
1. It won't really serve as HA, as pool pairing is the only option it's more of a DR solution. The RTO for a pool failover is 30mins. So it could take anywhere up to 30mins. http://technet.microsoft.com/en-us/library/jj205079.aspx
2. Same as above. Here is how you failover http://technet.microsoft.com/en-us/library/jj204678.aspx
3. Yes, you can co-locate Persistent Chat on the Front End with Standard Edition. If sized correctly, there should be no performance issues.
4. The only option with Standard is Pool Pairing, so no better suggestions.
If this helped you please click "Vote As Helpful" if it answered your question please click "Mark As Answer"
Georg Thomas | Lync MVP
Blog www.lynced.com.au | Twitter
@georgathomas
Lync Edge Port Check (Beta)
This forum post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Lync 2013 Standard Edition on Cisco UCS E-Series

Hello,
We have a working Lync 2013 deployment:
- Front-End Enterprise Pool consisting of 3 FE servers
- one Edge Server
- one Back-End server
- one Mediation Server
- one IP PBX gateway, where ITSP's SIP trunks end.
Because we have geographically distributed offices, we are considering deploying of branch offices deployments.
Technet recommends to use SBA for branch offices where there are less than 1000 users. But in case of WAN outage, no conferencing will be available for branch users.
Lync 2013 Standard edition branch deployment would offer all Lync features in case of WAN outage.
In every branch, we consider deploying a Cisco ISR G2 router for terminating branch SIP trunks. This equipment have option to add Cisco UCS E-Series blade that supports CPU with hardware virtualization and supports decent amount of RAM (up to 16GB and up
to 48GB).
Have anyone experience with deploying Lync Standard Edition on this equipment - Cisco UCS E-Series blades? In every branch office there are up to 50 - 500 users that will use Lync.
Thanks,
Andrei Moraru Endava

Hi,
I don’t think you can deploy Lync server 2013 on Cisco UCS E-Series blades.
Here is a link below of “System Requirements for Servers Running Lync Server 2013” may help you:
http://technet.microsoft.com/en-us/library/gg398588.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

Lync 2013 Standard backup questions

Hello
I need to backup our Lync 2013 Standard Edition setup.
We have Only one server atm.
Looking at this post for inspiration:
http://blogs.technet.com/b/heyscriptingguy/archive/2014/06/28/weekend-scripter-basic-lync-server-2013-backup-and-restore-part-1.aspx
As far as i can understand, i don't need to do SQL backup at all? Or am i missing the point?
Would I be able to restore my Lync from these 3 commands:
Export-CSConfiguratiom, Export-CSLisConfiguration and Export-CsUserData - Is that enough for a disasterrecovery?
And a bonus question:
When i run Export-CSLisConfiguration . The export only contains the following:
<?xml version="1.0"?>
<LisDatabase xmlns="urn:schema:Microsoft.Rtc.Lis.Database.2008"/>
Is that not incomplete somehow?

That much would get you back up and running, yes. But it may not be a "full" restore.
For example, if you have persistent chat data, it wouldn't necessarily be included in there. If you have an archiving database where all IMs are sent, that information wouldn't be in the PowerShell exports above. If you don't have a copy of the
certificate and private key, that's lost.
Typically, I run my own custom version of Lasse's backup script https://gallery.technet.microsoft.com/Backup-script-for-Lync-2013-aacbb9b9
That pulls all the data, including your file stores, SQL exports, certificates, and everything into a single folder and zips it for you. If you back those zips up, you'll have most everything.
Restoring directly back into SQL isn't the recommended method, if you did need to get back up you'd want to follow standard restore procedures by using the supported PowerShell, but you'll have other avenues to restore if needed and a more complete copy
of your data.
The LIS export may be complete if you don't have any Lync locations defined. You'd typically enter these for 911 purposes.
Check out Lasse's Channel 9 video as well:
http://channel9.msdn.com/Events/TechEd/Europe/2014/OFC-B331
Check out his backup series docs here as well:
http://tech.rundtomrundt.com/search/label/Backup-Lync2013
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer".
SWC Unified Communications
This forum post is based upon my personal experience and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Unable to start Lync 2013 FE service on one of the pooled server, error "The evaluation period for Microsoft Lync Server 2013 has expired"

Team,
Unable to start FE service on one of the FE server, 2 Enterprise lync 2013 pool one FE in each pool, only following error in event vrw,
Log Name: Lync Server
Source: LS Server
Date: 12/30/2013 12:10:55 PM
Event ID: 12290
Task Category: (1000)
Level: Error
Keywords: Classic
User: N/A
Computer: ACS465-BH102.me.ykgw.net
Description:
The evaluation period has expired.
The evaluation period for Microsoft Lync Server 2013 has expired. Please upgrade from the evaluation version to the fully licensed version of the product. Look at help for Setup.exe to learn how to upgrade from evaluation version to the licensed version.
Cause: The evaluation period for Microsoft Lync Server 2013 has expired.
Resolution:
Please upgrade from the evaluation version to the licensed version of the product. Look at help for Setup.exe to learn how to upgrade from evaluation version to the licensed version.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="LS Server" />
<EventID Qualifiers="50152">12290</EventID>
<Level>2</Level>
<Task>1000</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2013-12-30T09:10:55.000000000Z" />
<EventRecordID>73953</EventRecordID>
<Channel>Lync Server</Channel>
<Computer>ACS465-BH102.me.ykgw.net</Computer>
<Security />
</System>
<EventData>
</EventData>
</Event>
Log Name: System
Source: Schannel
Date: 12/30/2013 12:13:36 PM
Event ID: 36888
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: ACS465-BH102.me.ykgw.net
Description:
The following fatal alert was generated: 10. The internal error state is 1203.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Schannel" Guid="{1F678132-5938-4686-9FDC-C8FF68F15C85}" />
<EventID>36888</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2013-12-30T09:13:36.779033200Z" />
<EventRecordID>83985</EventRecordID>
<Correlation />
<Execution ProcessID="556" ThreadID="3668" />
<Channel>System</Channel>
<Computer>ACS465-BH102.me.ykgw.net</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="AlertDesc">10</Data>
<Data Name="ErrorState">1203</Data>
</EventData>
</Event>
Server is already on Full version, ran Reset-CsPoolRegistrarState
for fillrest as wel as serviceret
Followed below as well,
http://social.technet.microsoft.com/Forums/lync/en-US/2a7e27ce-2dea-4e37-91ea-1ed42e110198/issue-updating-from-eval-to-volume-licenses?forum=ocsplanningdeployment
Currently done failover to another pool and users can login,
however i cant get the front end service on this server.Any pointers would be appreciated.
Praveen | MCSE Messaging 2003

rit, the command is not doing the trick since its already full version,
PS C:\Users\lyncadmin> Get-CsServerVersion
Microsoft Lync Server 2013 (5.0.8308.0): Volume license key installed.
only one server in one pool, total two pools.
Lync 2013 is on Win 2008 R2, and the event in system im inclining to since i have tried all,
Log Name: System
Source: Schannel
Date: 12/30/2013 9:26:34 AM
Event ID: 36888
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: ACS465-BH102.me.ykgw.net
Description:
The following fatal alert was generated: 10. The internal error state is 1203.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Schannel" Guid="{1F678132-5938-4686-9FDC-C8FF68F15C85}" />
<EventID>36888</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2013-12-30T06:26:34.877077500Z" />
<EventRecordID>64911</EventRecordID>
<Correlation />
<Execution ProcessID="556" ThreadID="620" />
<Channel>System</Channel>
<Computer>ACS465-BH102.me.ykgw.net</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="AlertDesc">10</Data>
<Data Name="ErrorState">1203</Data>
</EventData>
</Event>
Praveen | MCSE Messaging 2003

Lync 2013 standard deployment: Exchange 2010 Sharepoint 2010 and outlook 2007 collaboration

HI
I have Exchange 2010 and sharepoint 2010 with all our user using outlook 2007. what options do I have for collaborations between these systems if I was to install Lync 2013. I have seen posts that mention that you cannot use outlook 2007 and lync 2013 and
that you would be better off installing the lync 2010 client?
1. would we be covered from a licensing point of view if we had bought lync 2013 cals but install the lync 2010 software on desktops?
2. what Cals do we require for presence to be available in SharePoint we currently have standard sharepoint cals?
3. what new features will we loose if we install 2010 lync software.
4. if our mobile users use the 2013 lync software will these be able to communicate with the 2010 users?
thanks
J

Hi,
If you use Lync 2013 client with Outlook, multiple functions will not be achieved, such as: customize Outlook meeting invitations (add logo, help URL, disclaimer, footer text), in Outlook, configure meeting option to mute attendee audio and video by default,
presence status in the Microsoft Outlook To and Cc fields, and so on. As Lync 2013 is the part of Office 2013, the best choice is using Outlook 2013.
More details:
https://technet.microsoft.com/en-us/library/gg412817.aspx
For the CAL requirement, you can refer to following link:
Lync Licensing Guide
You can refer to the link below of “What’s new for clients in Lync Server 2013” to understand the new features for Lync 2013:
https://technet.microsoft.com/en-us/library/jj204933.aspx
If you use Lync 2013 mobile clients, you can communicate with 2010 users with no possible.
Best Regards,
Eason Huang
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Eason Huang
TechNet Community Support

Lync 2013 Intergration with Siemens HiPath 4000 and HiPath 3500

Dear All,
We have implemented Lync 2013 with 2 FE , 1 PChat , 1 OWA and 2 Edge Server (DNS Load Balancing with NAT) , we are now in the next phase where we need to provide complete voice integration,
The customer is currently using Siemens HiPath 4000 at main office and Siemens HiPath 3800 and HiPath 3500 at the Branch offices,
Our scope is as under,
1) As first part intergrade the we have to integrate it with Siemens HiPath 4000 , with below features,
a) Lync User ability to dial via the PRI Lines
b) Lync User to receive Calls made to their Siemens extension on Lync Client ( Simultaneous ringing or enabling mobility (Similar to Cisco Mobility- When DID calls come they ring both on physical phone and Lync Client)
c) Features Such as Call forwarding , Hunt Groups , Integrated Exchange 2010 UM support ,
Finally Since we need to phase out Siemens we would have SBC 2000 gateway
We have 5 PRI lines going to Siemens HiPath , post this we would transfer one of the lesser used PRI to SBC 2000 , while maintaining complete functionality,
A similar setup would also be done at the Branch Office , except that we would be having SBC 1000 at one of the branch offices and Sangoma Lync Express at the other Branch Offices,
What we need ,
1) Design related suggestions
2) Implementation related challenges and hurdles
3) Dos and Donts , we do not want to over commit the client and then regret,
4) Any kind of Guide and similar scenarios implemented by other , step by step documents,
5) Best Practices , limitations and things to avoid, Suggestions
Thanks and Regards,
Hasan Reza

Dear All ,
I am sure all you guys who have advised me are much more experienced and have a better understanding of Voice,
I would like to rest my solution based on below design , before I submit the same to the customer, Need one final check list , Pls advise / confirm ,
Also please help me with the pre-requisites that I need to go to client with ? If there is something missing pls highlight
Looking at the changed design ,
Here is call flow
1) Calls comes via ---> PRI to Siemens HiPath
2) Hipath locally routes the call if the Extension is present in the Local System
3) If not then call is sent to Sip Trunk that would be accepted by the Sonus 2000
4) Sonus would then forward to the call to Lync 2013
5) Lync 2013 establishes the call with Lync Client
In this scenario , what would be the impact on below
0) Can we have same series of extension , for example (4001, 4002 , 4003 on traditional PABX , and have 4101,4102,4103 on Lync 2013)
1) Conference calls between Lync and Traditional PABX Systems
2) Currently all the Extension are configured with DID nos , any out going calls has the users DID no , after a user is moved to Lync 2013 , then the DID number associated with user , how would that behave ?
3) Can from a I transfer a user and his/her PRI to Sonus, or I should transfer the entire PRI Bunch,
4) Will there be an impact on caller ID , MOH (Music on Hold) , Hunt groups,
5) Will the same concept be used for Branch Offices as well ?
Please pardon my queries but if the above are made clear I am sure many people would benefit from this blog.
Thanks and Regards,
Hasan Reza

Lync 2013 Standard, publishing externally via edge/TMG

Hi
I am looking into implementing lync into our environment and have been considering using lync standard in the following setup
total users will be 3000 so thinking of placing 1500 on each server at primary site A and then pairing them with the servers at site B we will only really be using this for IM and Presence. The Primary site will be where all the users are located and only
in DR will we failover to the DR site.
Site A (Primary)
1x FEA1 1xBEA1
1x FEA2 1xBEA2
1x FEedgeA1
Site B (DR)
1xFEB1 1xBEB1
1xFEB2 1xBEB2
1xFEedgeB1
my questions are this
1. If we have two servers in site A each with a separate pool because they are standard, how many external URLS will I have to have if I am connecting using a Iphone using the lync client?
2. If a server goes down in site A and we fail the users over to site B what will happen to the Iphone users how will they connect back onto lync does this require the users to enter a new URL?
3. does Lync edge server require a public IP address and should its internal address be an IP on the DMZ or the internal LAN?
4. do you need TMG/ARR/WAP to reverse proxy lync or can Lync edge do this on its own for Iphone devices wanting to use IM?
5. In the standard lync model is the backend server a role or a separate server or can it be both, above I have listed as separate servers but was not sure if this could be a role on the FE?
thanks in advance
J

Hello,
Please find the answers below;
Each Lync pool need to publish external web service URL. Simple URLs can be shared between pools. So you need to publish meet ; dialin , lyncdiscover and webextA1 and webextA2. I assume , your sip domain remains the same for all pools.
In a DR scenario , you will have to make external DNS changes and repoint Lyncdiscover record to site B reverse proxy server.
Yes, edge server require public IP address. Internal edge IP address should be reachable from user VLAN. So internal IP should be fine.
Reverse proxy is required for mobility connectivity.
Lync standard edition backend database will be installed on the same box.
Thanks
Saleesh
If answer is helpful, please hit the green arrow on the left, or mark as answer.
Technet Blog

How to access Lync 2013 standard database?

Just trying to figure out how to access the SQL express database that gets installed during the Lync install. Is there a default SA password or group that i can put myself in? When i installed all the databases were thrown all over the different drives.
I want to clean that up.
Thanks!

Three database instances are created with Standard edition Lync. Check out RTC, RTCLocal, and LyncLocal. Everything you need should be in there. Make sure you run as admin when accessing these databases if you're attempting to access
them from the Front End itself.
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer".
SWC Unified Communications

How to hide or masked my Lync 2013 phone number?

I need to make outbound calls in France, Belgium and Switzerland, to our customers, but I don't want that they see my Lync phone number and call me back. Is there any chance to hide my number or just to masked it?

Hi,
Lync Server provides a way to manipulate the caller ID for outbound calls using
Configuring Caller ID. An administrator can do that by using Lync Server Control Panel Voice Routing—Voice Routes interface to suppress the caller ID and replace it with a specified alternative caller ID.
Also, you can configuration calling number translation rules in trunk configuration.
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

WindowsPhone Lync 2013 - No message sync between phone and desktop apps

If Lync is running on my phone and desktop, incoming messages appear in both clients. However, messages I send are not reflected in the other client. This means that if I have a conversation from my phone, when I return to my desk all I see in the conversation
window are the incoming messages.
Skype handles message sync across all clients, Why doesn't Lync?
Cheers!
Matt

Hi,
Lync Server determines which endpoint is currently most active for that user. For example, a user might be Away at two of the three endpoints, so the server sends the message only to the endpoint where the user is Available. If the server is unable to determine
which state is most active, it sends the message to the endpoint it determines most likely active and waits to see if the user acknowledges the toast at any location. If the user opens the toast at an endpoint, the server removes the message from the other
endpoints. If an endpoint doesn’t acknowledge the message, the server leaves the message at only one location which is the most likely endpoint.
Best Regards,
Eason Huang
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Eason Huang
TechNet Community Support

Lync 2013 Certificate Count

Hello, I'm new to Lync.
Can someone help me in determining how many certificates I need for the following:
Lync 2013 Standard in Production Site A and DR Site A with pools paired
Lync 2013 Standard in Production Site B and DR Site B with pools paired
Can I get away with a single certificate and include all the SAN names, or do I need a certificate per pool pair or certificate per site?
Thanks.

Since these are internal servers, it's preferable to use an internal CA and use separate certificates.
Since the subject/common name of the cert should be the FQDN of the pool:
http://technet.microsoft.com/en-us/library/gg398094.aspx. You'll want at least one cert per pool.
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SWC Unified Communications

Lync 2013 standard number of Backends required and pool paring setup?

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